In late 2375, the Breen became allies of the Dominion, where they committed a large fleet of warships to join the war effort. Worf and Ezri Dax were brought aboard a warship after being captured by the Breen on a planet in the Goralis system.

The Federation first encountered the ships in combat during the Second Battle of Chin'toka. The Cardassian and Dominion ships held back while the Breen engaged the Federation, Klingon and Romulan forces. The ships had been equipped with energy dissipators that disabled the Allied ships' engines, weapons, and shields. The weapon was instrumental in defeating the Allied fleet and forcing the Federation Alliance from the Chin'toka system, losing the only enemy territory that they held in Cardassian space.

Even without the energy dampening weapon, the Breen warships proved to be formidable. One such ship destroyed Legate Damar's ship in orbit of Cardassia Prime. Several warships participated in the Battle of Cardassia. During this engagement, a Breen warship was able to outmaneuver the USS Defiant, displaying exemplary maneuverability. Several Breen warships were destroyed by the Cardassian fleet when the Cardassians joined the Allies. Breen warships were also deployed in orbit of Cardassia Prime after the Dominion's retreat

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